A new self-tapping sleeve

Abstract

The utility model discloses a novel self -tapping thread sleeve, is located at the top of self -tapping thread sleeve and set up the locating pipe, and the locating pipe is coaxial with self -tapping thread sleeve and is equipped with the through -hole matched with self -tapping thread sleeve on the locating pipe. The novel self -tapping thread sleeve of this design is used to connect rear floor and auxiliary frame, compared with the existing self -tapping thread sleeve, this design can make the accurate butt joint of rear floor when the auxiliary frame installation can be convenient and fast, improves the installation efficiency, and reduces the transverse shaking of auxiliary frame and the bolt for fixed connection.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to a novel self-tapping threaded sleeve. Background Technology

[0002] Self-tapping threaded sleeves are composite fasteners that combine the characteristics of self-tapping screws and threaded sleeves. They are mainly used to enhance the thread strength of soft substrates or repair damaged internal threads. Their external threads have self-tapping properties, allowing them to be directly screwed into pre-drilled holes in the substrate to form new threads. The internal threads are standard threads, used for connecting bolts or other fasteners.

[0003] It is also widely used in the automotive industry, for example, in the connection between the rear floor and the subframe of a car. Existing threaded sleeves used for connecting the subframe and rear floor have the following problems: 1. Existing threaded sleeves for connecting the rear floor and subframe are all T-shaped structures. This requires aligning multiple mounting holes during installation, and the installation difficulty increases exponentially with the number of mounting holes. Furthermore, due to the difficulty of installation, the mounting holes on the subframe need to be very large, which reduces structural strength. 2. During use, the vehicle vibrates. The position between the rear floor and the subframe depends entirely on the connecting bolts, which only provide vertical pressure. Therefore, when the rear floor and subframe shake, a shear force acts directly on the bolts, easily damaging them or even cutting them off. 3. The existing threaded sleeve only has internal threads on the inner wall of the sleeve. Therefore, the connecting bolt is only tightly connected to the lower half of the sleeve. From the cap to the bolt cap, there is no contact, which makes it easy for the rear floor and the subframe to shake. Summary of the Invention

[0004] The problem to be solved by this utility model is to propose an improvement or replacement scheme for the shortcomings of the prior art, especially an improvement or replacement scheme for a new type of self-tapping threaded sleeve.

[0005] To solve the above problems, the present invention adopts the following solution: a novel self-tapping threaded sleeve, characterized in that a positioning tube is provided at the top of the self-tapping threaded sleeve, the positioning tube is coaxially arranged with the self-tapping threaded sleeve, and the positioning tube is provided with a through hole matching the self-tapping threaded sleeve. The positioning tube is preferably a circular tube structure, but its outer wall can also be set as a polygonal structure while still serving the positioning function.

[0006] Furthermore, the novel self-tapping threaded sleeve is characterized in that the self-tapping threaded sleeve includes a cap and a body; the body and the cap form a T-shaped structure, the outer wall of the body is provided with a self-tapping external thread, the inner wall of the body is provided with an internal thread, and the internal thread extends along the through hole through the cap to the positioning tube.

[0007] Furthermore, the novel self-tapping threaded sleeve is characterized by further including driving teeth, which are disposed on the inner wall of the end of the positioning tube. When the driving teeth are disposed on the inner wall of the positioning tube, the driving structure is a thin-walled driving structure, and the shape of the driving teeth can also be set as a quincunx shape, polygonal shape, or multi-tooth shape, provided that the driving function is satisfied.

[0008] Furthermore, the novel self-tapping threaded sleeve is characterized in that the outer wall of the tube body has a curved triangular structure and the inner wall has a circular structure.

[0009] Furthermore, the novel self-tapping threaded sleeve is characterized in that a layer of lubricating grease is applied to the self-tapping external thread at the end of the tube body.

[0010] Furthermore, the novel self-tapping threaded sleeve is characterized in that both the positioning tube and the tube body have rounded corners at the connection with the tube cap.

[0011] Furthermore, the novel self-tapping threaded sleeve is characterized in that the lubricating grease is any one of lithium-based grease, molybdenum disulfide grease, silicone-based grease, and polyurea grease.

[0012] The technical effects of this utility model are as follows: 1. The new self-tapping threaded sleeve of this design adds a protruding positioning tube to the tube cap. During assembly, it is only necessary to put the mounting hole on the subframe onto the positioning tube. There is no need to pay attention to whether the mounting hole on the subframe is aligned with the threaded sleeve at all times, which greatly reduces the assembly difficulty and improves work efficiency.

[0013] 2. The protruding positioning tube is inserted into the subframe during assembly. Therefore, the connection between the subframe and the rear floor no longer relies solely on bolts. While the bolts provide vertical pressure, the protruding positioning tube also provides lateral resistance, preventing displacement between the subframe and the rear floor due to vehicle vibration. Simultaneously, the connecting parts of the bolts no longer directly contact the subframe and rear floor. Therefore, during vehicle vibration, the shear force generated by the subframe and rear floor is no longer applied to the bolts but is borne by the positioning tube. The positioning tube protects the bolts, thus extending bolt life and improving overall structural strength.

[0014] 3. Extend the internal thread on the inner wall of the tube to the middle of the positioning tube, shorten the length of the non-contact section of the bolt, increase the contact surface between the bolt and the self-tapping threaded sleeve, improve the strength and stability of the connection, and further reduce the chance of shaking between the rear floor and the subframe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a new type of self-tapping threaded sleeve structure.

[0016] Figure 2 This is a cross-sectional schematic diagram of the new self-tapping threaded sleeve connection installation.

[0017] Figure 3 This is a schematic diagram of a tube with a curved triangular structure.

[0018] Among them, 1 is the tube body, 2 is the tube cap, 3 is the positioning tube, 4 is the internal thread, 5 is the self-tapping external thread, 6 is the drive gear, 7 is the rear floor, 8 is the subframe, and 9 is the bolt. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figure 1 As shown, a novel self-tapping threaded sleeve includes a cap 2, a body 1, and a positioning tube 3. The body 1 and the positioning tube 3 are located on both sides of the cap 2 and are coaxially arranged. The outer diameter of the body 1 and the positioning tube 3 is smaller than the outer diameter of the cap 2. A through hole is provided along the centerline of the body 1, the cap 2, and the positioning tube 3. The outer wall of the body 1 is provided with a self-tapping external thread 5, and the inner wall is provided with an internal thread 4. The internal thread 4 extends through the through hole, through the cap 2, and to the middle of the positioning tube 3. The end of the positioning tube 3 is provided with a driving tooth 6, which is located on the inner wall of the positioning tube 3.

[0021] like Figure 3 As shown, the outer wall of the tube body 1 has a curved triangular structure, and the inner wall has a circular structure. The connection between the tube body 1 and the cap 2 is rounded. A layer of grease is applied to the self-tapping external thread 5 at the end of the tube body 1. The outer wall of the positioning tube 3 has a circular structure, and the connection between the positioning tube 3 and the cap 2 is rounded. The grease is lithium-based grease.

[0022] like Figure 2 As shown, when the new self-tapping threaded sleeve of this design connects the rear floor and the subframe, the positioning tube on the new self-tapping threaded sleeve is inserted into the interior of the subframe, which not only facilitates positioning but also provides lateral support to prevent the subframe from damaging the bolts due to vibration.

[0023] The novel self-tapping threaded sleeve of this embodiment adopts a curved triangular structure for its tube body, and a triangular self-tapping thread, i.e., a self-tapping external thread, is provided on the outer surface of the tube body. Furthermore, a layer of grease is applied to the end of the self-tapping external thread. The grease is preferably polyurea grease. The combination of the triangular self-tapping thread and the grease can effectively reduce the friction during the tapping stage.

[0024] Due to the physical characteristics of self-tapping threads, the opening of the self-tapping threaded hole inevitably expands. This design incorporates a smooth, rounded corner at the connection point between the cap and the pipe body to seal the opening of the self-tapping threaded hole, ensuring a tight connection between the self-tapping threaded sleeve and the substrate, eliminating cavities, and improving sealing performance. This self-tapping threaded sleeve is designed for use on metal substrates such as aluminum alloys; therefore, SCM435 is preferred as the manufacturing material. As it is a self-tapping fastener, a driving structure is also essential in the positioning mechanism.

Claims

1. A novel self-tapping threaded sleeve, characterized in that, A positioning tube is installed at the top of the self-tapping threaded sleeve. The positioning tube is coaxially arranged with the self-tapping threaded sleeve, and the positioning tube has a through hole that matches the self-tapping threaded sleeve.

2. The novel self-tapping threaded sleeve according to claim 1, characterized in that, The self-tapping threaded sleeve includes a cap and a body; the body and the cap form a T-shaped structure, the outer wall of the body is provided with a self-tapping external thread, the inner wall of the body is provided with an internal thread, and the internal thread extends along the through hole through the cap to the positioning tube.

3. The novel self-tapping threaded sleeve according to claim 2, characterized in that, It also includes drive teeth, which are disposed on the inner wall of the end of the positioning tube.

4. The novel self-tapping threaded sleeve according to claim 2, characterized in that, The outer wall of the tube is a curved triangular structure, and the inner wall is a circular structure.

5. The novel self-tapping threaded sleeve according to claim 2, characterized in that, A layer of grease is applied to the self-tapping external threads at the end of the tube.

6. The novel self-tapping threaded sleeve according to claim 1, characterized in that, Both the positioning tube and the tube body have rounded corners at their connection with the tube cap.

7. The novel self-tapping threaded sleeve according to claim 5, characterized in that, The grease is any one of lithium-based grease, molybdenum disulfide grease, silicone-based grease, or polyurea grease.

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